Pressure-blower.



N0- 757,267. PATENTED APR. 12, 1904.

A. 'W'. CASE.

PRESSURE BLOWER.

APPLICATION FILED FEB. 13, 1903.

N0 MODEL.

- UixnTnn STATES Patented April 1Q, 1904.

PATENT OFFICE.

PRESSURE-BLOWER.

SPECIFICATION forming part of Letters Patent No. 757,267, dated April12, 1904.

- Application filed February 13.1903. Serial No. 143,243. (No model.)

1'0 all whom, it may concern: 1

Be it known that I, ALFRED VVELLS CAsE, a citizen of the United States,residing at Highland Park, in the county of Hartford and State ofConnecticut, have invented certain-new and useful Improvements inPressure-Blowers, of which the following is a specification.

This invention relates/ to a blower which has fan-blades so inclosedthat when in operation air will be thrown ofl' from the localities wherethe pressure is the greatest and pre-' vented from eddying back to thelocalities where the pressure is less.

The object of the invention is the production of a blower which issimple and cheap to construct, which can be operated with comparativelylittle power, and .which will cause the flow of a large volume ofairunder considerable pressure.

When the common blower is in operation, there is more pressure just infront of each blade than there is justbehind each blade, due

to the motion of the blades, and if the air in the system is under somepressure the tendency is for the air in front of each blade to flowaround to the back of each blade that is, from a locality of greaterpressure to a locality of less pressure instead of flowing through theoutlet into the piping of the system. With the present construction theair is only\allowed to escape from the localities where it is under thegreater pressure and is prevented from returning to the localities wherethere is less pressure.

The blower that is illustrated as embodying the invention has asuitably-su 'iported spiral shell with central inlet and tangentialoutlet. The fan-blades are mounted on a. shaft borne by bearings held bybrackets that are secured to the sides of the shell and are almostontirely inclosed between two' annular plates which are only "open atthe center to provide for the inflow of air and a peripheral plate whichonly has an opening through it just in front of each blade to providefor the outflow of air from in front of each blade and prevent thereturn of air behind each blade.

Figure l of the accompanying drawings shows a side elevation of a blowerthat embodies the invention. Fig. 2 shows an edge central verticalsection.

elevation of the blower with the. shell out in Fig.3 shows a sideelevation of the rotatory part of the blower with a portion of one ofthe side plates broken away, so as to show the fan-bladesand theperipheral plate with the openings in front of each blade.

The shell 1 is formed of thin metal in a spiral form in a common manner.This shell is supported by feet 2 and has an outlet 3'at the bottom andan inlet 4 through each side. Extending outwardly from each of the sideplates f "the shell is a bracket 6, supporting bearings 7, which hold ashaft 8. Projecting from the shaft are a number of arms 9, to eachofwhich a fan-blade 10 is secured. Each side ofthe fan-blades andsecured so as to rotate with them is an annular plate 11. Around theperiphery of the blades and the annular plates is a plate 12. Thisperipheral plate is provided with a number of small openings 13, onebeing just in front of each of the blades. A tube 14 is secured to thefan-blade arms, so as to project outwardly through the opening of theannular plate on each side. On the side wall of the shell about eachtube an annular packing 15, of .leather or other suitable material, isplaced. This is preferably held in position by.a ring 16, which isscrewed or riveted to the side wall of the shell about the outer edge ofthe packing. Upon each tube outsideof the leather a collar 17 isattached.

These parts are so arranged that any tendency toward an outward flow ofair from the casing around the tubes when the machine is in operationcauses the paekings to press against the collar and form a tight joint,and thus prevent leakage.

This construction is very simple. The air close in front of eachfan-blade when the ma chine is in operation is thrown off through theopening in the peripheral plate and can not return back of the blade,where there is always more-or less tendency to a vacuum created by theforward movement of the blade.

All counter circulation from in front of a fanblade around to the backof the same blade or any eddying circulation behind the back of theblade next in front--that is, from a locality where the air-pressure isgreater-to a locality where'the air-pressure is less-is prevented by theperipheral plate which covers the openingback of each blade Where thepressure is less. With this construction the air is directed outwardly011' from each blade from the locality where it is under the greatestpressure and of necessity has to be driven out through the'outlet, forthe openings are so small through the peripheral plate that it can-'extending arm secured tothe lower part of' each annular plate, bearingssupported bythe arms, ashaft held by the bearings, a fan 10- catedwithinthe shell and supported by the shaft, the said fan consisting of radialarms, fan-blades fastened to the arms,an annular plate supported-by thearms eachside of the blades, .a peripheral plate encircling the bladesand sideplates and having=a relatively small opening immediately infront of each blade, tubes extending outwardly from theside plates ofthe fan through the annular plates fastened to the sides of the shell, apacking secured to each side plate of the shell about a tube, and acollar on each tube outside of each packing, substantially as specified.

ALFRED Witnesses: v

HARRY R..WILLIAMs,

WELLS CASE.

